[8845] fixed some gcc warnings

[newsbot]

<pre>m src/game/AchievementMgr.cpp
m src/game/Channel.cpp
m src/game/Chat.cpp
m src/game/Creature.cpp
m src/game/CreatureAISelector.cpp
m src/game/CreatureEventAI.cpp
m src/game/GameEventMgr.cpp
m src/game/GameObject.cpp
m src/game/GossipDef.cpp
m src/game/Group.cpp
m src/game/GuildHandler.cpp
m src/game/InstanceSaveMgr.cpp
m src/game/LFGHandler.cpp
m src/game/LootHandler.cpp
m src/game/Mail.cpp
m src/game/Map.cpp
m src/game/MiscHandler.cpp
m src/game/Object.cpp
m src/mangosd/Master.cpp
m src/shared/revision_nr.h

[8845] fixed some gcc warnings</pre>



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